Hey guys! New to hvac-talk. I’m searching for the best vacuum pump with two ports for a quick process. I don’t know that the fieldpiece with the removable oil containers is worth it but I wanted to see what you guys use and what you like and dislike so that I can make an informed decision. Price tag doesn’t matter. Thanks in advance!
Best vacuum pump?
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Hvacguy91
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Hey guys! New to hvac-talk. I’m searching for the best vacuum pump with two ports for a quick process. I don’t know that the fieldpiece with the removable oil containers is worth it but I wanted to see what you guys use and what you like and dislike so that I can make an informed decision. Price tag doesn’t matter. Thanks in advance!
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33,565 Posts
I'm sure you can afford it. I'll give you permission.Yes my friend has one we used on a compressor replacement.
Quiet and quick but I only have that one time experience.
He works for CBRE and gets all the nice toys
Cool. I’ve read it’s great for residential change outs. I’ll probably get the 4cfm one if I go that route and then pick up an extra battery. I’d also like to get the trublu kit but it seems like there’s a ton of components.
My friend has it and says the longest it’s ever taken him to pull a vacuum was 10 minutes, which seems crazy to me but awesome if that’s all it takes!
I had to do the electrical tape fix on my old jb pump that I’m currently using. That thing is a tank but it’s been doing some weird on off at startup and it’s old so I think it’s time for a new one
My friend has it and says the longest it’s ever taken him to pull a vacuum was 10 minutes, which seems crazy to me but awesome if that’s all it takes!
I had to do the electrical tape fix on my old jb pump that I’m currently using. That thing is a tank but it’s been doing some weird on off at startup and it’s old so I think it’s time for a new one
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33,565 Posts
The tru blu kit is totally worth it. With that you can use the smallest pump available on residential systems and still beat the guys using a manifold.
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On system replacements with reused line sets I usually pull under 500 microns in well under 2 minutes using my JB 5 CFM and try blu hoses. I generally pull lower than 100 microns because I like to leave my pump running long enough to heat up the oil in the pump.
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13,735 Posts
4-5 cfm and larger pumps are overkill on residential and smaller units. Ok for noncondensables, but may leave moisture behind. Only 30-60 minute or longer hold test will insure dry & tight.
Rapid pressure drops will cause moisture to freeze an increase evac times by 4x or longer.
Rapid pressure drops will cause moisture to freeze an increase evac times by 4x or longer.
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33,565 Posts
The thing is the rate at which you pull a vacuum does not change the rate at which heat can get into the moisture in the system to boil it. Just because you pulled a vacuum fast enough that you used up the available Heat and the water froze doesn't mean the rate at which the heat can enter the system and vaporize the water changed so that water is going to then thaw and boil and come out eventually. Obviously you need to do a proper hold test or you won't know if it's dry or not.
P.s I would use a smaller vacuum pump if JB industries built one
So for residential change outs and retrofits, would you guys recommend the navac 4cfm? They also have a 2cfm? And I’d probably get an extra battery. I typically only do one change out per day so I wouldn’t need to run it a ton in one day.
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25 Posts
4 CFM JB is a good choice for residential.
I don't think so. The CFM rating is at atmospheric pressure. A pump that is bigger than needed isn't going to pull too quick. A pump that is bigger than needed will be heavier and cost more, but that is about the most damage that it can do.
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13,735 Posts
Read the mfg’s engineering literature. Can’t fight science.
Also you obviously have never seen a h2o tp chart.
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